Global Patent Index - EP 1324052 A3

EP 1324052 A3 20041103 - Mechanical force sensor

Title (en)

Mechanical force sensor

Title (de)

Messaufnehmer für mechanische Kräfte

Title (fr)

Capteur de forces mécaniques

Publication

EP 1324052 A3 20041103 (EN)

Application

EP 02028986 A 20021227

Priority

  • JP 2001400933 A 20011228
  • JP 2002326605 A 20021111

Abstract (en)

[origin: EP1324052A2] A mechanical-force sensor includes two piezoelectric vibrators which are arranged such that stresses in mutually opposite directions are applied thereto by a mechanical force such as an acceleration. A current-voltage converter and signal-summing circuit converts current signals that flow through the two piezoelectric vibrators into voltage signals. A voltage-amplifier and amplitude-limiter circuit amplifies a sum signal of the two voltage signals, and provides a positive feedback of a voltage signal that is in phase with the current signals, thereby causing an oscillating operation. A phase difference-voltage converter circuit generates a voltage signal that is proportional to the phase difference between the voltage signals yielded by the conversion. An amplifier and filter circuit DC-amplifies the voltage signal and removes unwanted frequency components therefrom. <IMAGE>

IPC 1-7

G01P 15/10; G01P 15/09

IPC 8 full level

G01P 15/09 (2006.01); G01P 15/097 (2006.01); G01P 15/10 (2006.01)

CPC (source: EP KR US)

G01L 1/162 (2013.01 - EP US); G01P 15/09 (2013.01 - EP KR US); G01P 15/097 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR

DOCDB simple family (publication)

EP 1324052 A2 20030702; EP 1324052 A3 20041103; CN 1233987 C 20051228; CN 1430046 A 20030716; JP 2003254991 A 20030910; JP 4066786 B2 20080326; KR 100512569 B1 20050907; KR 20030057448 A 20030704; US 2003164696 A1 20030904; US 6763726 B2 20040720

DOCDB simple family (application)

EP 02028986 A 20021227; CN 02160458 A 20021230; JP 2002326605 A 20021111; KR 20020085000 A 20021227; US 32950702 A 20021227